Sorry - will try and be more helpful:
In my experience if they are properly worried about you with anything to do with GD and potential effect on the baby they will fast track you so the fact that they're not doing that would indicate that your reading wasn't too alarming. There's a reason that the GD test is only given as standard (to higher BMI women) at around 26 weeks - before then, even if it is missed on urine/blood tests (mine was) then it is unlikely to have any negative effect on the baby. Try to eat sensibly (low/no carbs) in the run up to your appointment but don't worry too much about the delay.
If it turns out you do have GD then definitely check out the thread on here but it really isn't the end of the world - it is very easily controlled with a diet that will mean you will barely gain any baby weight and - if that fails - medication. I have quite a severe case (actually suspect I was diabetic before pregnancy but that remains to be seen) and am on insulin but even that is not to onerous on me and the baby has been scanned very regularly to check on her size and has been dead on exactly where she should be for a "standard" pregnancy and that's the case for most women - you will be extremely well cared for!
It limits delivery options slightly, but only in that you will be induced at 40 weeks (if you get that far - I am currently 38 weeks and being given regular sweeps to try and avoid induction) and are unlikely to be "allowed" a home birth (although you still have the right to give birth wherever you chose, no matter what they may tell you!) but unless you are on heavy heavy insulin dosages (very unlikely) you will not be on any more interventions/drips etc for delivery than you would do otherwise.
Post birth, the baby will be monitored for around 24 hours to make sure he or she isn't suffering any glucose lows or highs (very very unlikely if you have been controlling your blood sugars) and that's that - you will almost definitely go back to normal within 6 weeks and will have another GTT to confirm that. As for all the scare stories about GD and childhood obesity - they are just that - there are far far greater risk factors for childhood obesity - some of which correlate with GD but a healthy mother with a good attitude to food who had GD is far, far less likely to have an obese child than one who didn't have GD but eats rubbish - correlation is not causation!
Hope that helps - I know all this because my consultant is GREAT and takes time to answer all my questions honestly - if you need one I hope you get the same and don't be afraid to ask anything!